已知函数f(x)=2cosxsin(x+
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)-
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.
(1)求函数f(x)的最小正周期T;
(2)若△ABC的三边a,b,c满足b
2=ac,且边b所对角为B,试求cosB的取值范围,并确定此时f(B)的最大值.
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